Alloy for electrical resistance



STATES FATENT @FiF-EQE...

FRANK F. HANSEN, OF CHICAGO, ILLINOIS, ASSIGNOR T0 HANSEN-HALLIBURTONMFG. COMPANY. OF CHICAGO, ILLINOIS.

ALLOY FOR ELECTRICAL RESISTANCE.

No Drawing.

T 0 all whomz't may concern: 1

Be it known that I, FRANK F. HANSEN, a citizen'of UnitedStates,-residing at Chicago. in the county of Cook and State ofIllinois. have im'ented a certain new and useful Improvement in Alloysfor Electrical Resistance, of which the following is a full. clear,concise, and exact description.

This invention relates to improvements in alloy for electricalresistance. This invention relates to improvements in those alloys usedfor electrical heating resistance units, as for instance in flat irons,electric stoves, toasters, etc., and the object of the invention is toprovide such a resistance as will havea Very high fusing point, whichwill be relatively inexpensive toinanufactu're and able to competecommercially with other resistance alloys.

In carrying out my invention, I combine chromium, tungsten and aluminum.the chromium being employed in a preponderating quantity because ofitscheapness and lowconductivity. The tungsten is used in small percents. and the aluminum in an appreciably less per cent. than thetungsten.

I have found the following proportions to be preferable Where the alloyis to be used for the purpose hereinbefore indicated.

Chromium 93% to 95% Tungsten; 2% to 6% Aluminum fr0In 25% to 1% PatentedApr. 19, 1921.

Serial No. 324,985.

An alloy of these proportions has afusing point of approximately 1300centigrade, is comparatively inexpensive to manufacture and is entirelysuitable for drawing out into wire and use in all devices whereelectrical heating units are employed.

I claim:

1. An electrical resistance. alloy containing, chromium. tungsten andaluminum, the chromium being in prepouderating amount compared with thecombined amount of tungsten and aluminum. andthe amount of tungstenbeing greater than the amount (if aluminum.

2. An. electrical resistance allo containimg. chromium. tungsten andaluminum. the tungsten and aluminum together constituting less thanseven per cent. of the whole and the tungsten being in greater quantitythan' the aluminum.

3. An electrical resistance alloy containing, chromium from 9391 to 95);tungsten from 2% to 6%, aluminum from 25% to 1%.

1. An electrical resistance alloy containing, chromium approximately95%, tungsten approximately 4%, aluminum approximately 1%.

In witness that I claim the foregoing I have hereunto subscribed my namethis 2d day of Sept, 1919.

FRANK F. HANSEN.

Witness META SCHMIDT.

